Shortly after answering the question of what is clenbuterol, many beginners want to jump straight to using this drug. That's because - no matter their current fitness level - many want a magical pie-in-the-sky solution to getting ripped fast. And while clenbuterol weight loss is rather quick, it's better to do as much as you can naturally before going the drug route. This is especially the case when considering that high blood pressure and increased heart rate are possible clenbuterol side effects. So if you've just polished off a 20-piece Chicken McNugget by yourself, work on your diet and cardio before reaching for clen.